Side frame section



Oct; 20, 1931. c. B. HARBISON SIDE FRAME SECTION Filed April 7, 1950 vWW wwww VPM

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Patented Oct. 20, 1931 UNITED STATESPATENT OFFICE I CLARENCE B.HARRISON, O]? LIMA, OHIO, A SS'IGNOB TO THE OHIO STEELFOUNDBY GOI- PANY,OF LIMLOHIO, A. CORPORATION OF OHIO snm rmn SECTION Application filedApril 7, 1930. Serial No. 442,052.

This invention relates to improvements in side frames of railway trucksand has for its principal object to provide an improved form oftransverse section for the tension and compression beam members of theside frame whereby the frame may be cast. with greater strength, butwith less danger of cracking than with present standard constructions.

One of the most widely used beam sections 10 now employed in east sideframes is known as the U'section in which the corners formed by the twoupright and cross webs of the section usually require the addition oftransverse fins or webs, generally termed cracking brack: ets, disposedat intervals of a few inches along the inner angles of said corners, soas to prevent the member from cracking during cooling; I find, however,that by modifying the shape of the beam section so that the antransverseweb meets with the upright webs at a wider curve describing anarc of substantially more than 90, the moment of inertia of the beam isgreatly increased, and furthermore the use of cracking brackets may beentirely dispensed with. w

The invention maybest be understood by reference to the accompanyingdrawings, in which Figure 1 is a side view. of aside frame constructedin accordance with my invention.

Figure 2 is an enlarged fragmentary beam section taken oli line 2-2 ofFig. 1.

Figure 3 is a modified form of beam section constructed in accordancewith my invention.

Referring to details of the em my invention illustrated in the drawings,a side frame, indicated generally at ,10, comprises an upper orcompression beam 11, and a lower or tension beam 12 meeting at theiropposite ends at journal boxes .13, 13 and separated 'near theircenterportions by up right columns 14, 14. The parts above described arearranged in their usual manner, so need not be described in ater detail.Referring more particular y to the features of the present invention, itwill be observed that the main portions of both the tension andcompression beams are formed with their transverse sections comprising a'of the beam, particularly against lateral and ent of modified U-shape,as shown in Figure 2, in which the upright webs 15, 15 diverge generallytoward arched corner ortions 16, 16 which in turn merge into theorizontal web 17, and the corner portions l6iare curved through an aresubstantially greater than 90, as is best indicated by their center lineat AA in Figure 2. The beam is thus substantially wider near thehorizontal web 17 than between the. upright sidewebs 15, 15. The uprightwebs 15, 15, cross web 17, and arched portions 16, 16 are all preferablyof substantially the same thickness.

The webs 15, 15 may also be provided with outwardly extending beads orlflanges 15a, 150 at their free ends, in the form shown the sides of thebeads being substantially flush with the widestpart of the adjacentarched corner 16.

With this construction, I find that the use of cracking brackets is notnecessary, as the formation of a-uniformly thick walled U- sectionhaving a relatively wide base and with the side walls tending toconverge inwardly from the base rather than being substantially-at rightangles thereto, as In ordinary U-shaped sections, practically eliminatesthe danger of cracking, and at the same 7 time greatly increases themoment of inertia torsional stresses. I In the modified form of sectionshown in 3, the side walls merge more directly into the arched corners16,16 so that their center lines, indicated at B-B, are inclined towardeach other throughout their length, instead of meeting their adjacentarched corners in a. reverse curve, as in the form shown in Figure 2.The result in increased moment of inertia and eliminationofcrackingissuh stantially the same in both forms.

I claim: j .1. Ina side frame, a longitudinal beam having a generallU-shaped cross section with its two upri t webs joining the transverseweb in a wi e curve extending through an are substantially more than 2.In a side frame, a longitudinal beam having a generally U-shaped crosssection, with its two upright webs inclined outwardly and joining thetransverse web in a wide curve of substantially uniform thicknessextending through an are substantially more than" 90. 3 p

5 3. In a railway truck side frame, a longi tudinal beam having anapproximately U- shaped cross section of substantially uniformthickness, and having the sectional center lines of the two upright websspaced apart substantially more adjacent the transverse web thanadjacent the free ends of said upright webs.

Signed at Lima, Ohio, this third day of April, 1930.

CLARENCE B; HARBISON.

